Fig. 7
A conceptual overview of the migration dynamics of Sognefjord veteran migrant brown trout (N = 250), derived from the conditional Arnason-Schwarz (CAS) model described in Table 3b. Shaded regions represent each habitat zone (F, I, M, O), within which values are divided by season (spring–summer/autumn and winter, denoted by yellow/orange and grey shading) and river (green shading). Estimates of survival probability (S) are weighted as an exponent of predicted residence duration (Pr(t), weeks). Arrows indicate the direction (inwards/outwards) and timing (spring–summer/autumn, winter) of migration probability between zones (ψ). Note: Predicted values of t were extracted from the LM (Fig. 5b, Table S3) for each habitat zone and season with values for spring–summer/autumn and winter-early/winter-late summed, corresponding to the seasonal estimates of S. Spring migration onset probabilities (Pr(mig)) were extracted from the GLM (Fig. 5a, Table S3) for an individual brown trout of mean TL, at a mean value of stQ and ΔQ for each river. Seasons were defined accordingly: spring/summer: WoY = 13 – 26, autumn: WoY = 27 – 40, winter: WoY = 1 – 12 and 41 – 52. Combined transition probabilities e.g., transition to outer-fjord includes ψXO where X includes F, I and M, to ease complexity in illustration. For specific transition estimates see Tables 3b & S9. “(.)” indicates that predictors were held constant, i.e., no seasonal effect on S in freshwater